import router from './router'
import store from './store'
import NProgress from 'nprogress' // progress bar
import 'nprogress/nprogress.css' // progress bar style
import { getToken } from '@/utils/auth' // get token from cookie
import getPageTitle from '@/utils/get-page-title'

NProgress.configure({ showSpinner: false }) // NProgress Configuration

const whiteList = ['/login', '404'] // no redirect whitelist
// 全局前置导航守卫
router.beforeEach(async(to, from, next) => {
  // start progress bar
  NProgress.start()

  // set page title
  document.title = getPageTitle(to.meta.title)

  // determine whether the user has logged in
  const hasToken = getToken()

  if (hasToken) {
    if (to.path === '/login') {
      // if is logged in, redirect to the home page
      next({ path: '/' })
      NProgress.done()
    } else {
      // 通过userId来判断userInfo的值是否是一个空对象
      if (store.getters.userInfo.userId) {
        next()
      } else {
        // 触发vuex中的actions里面的getInfo(),目的：获取用户信息
        await store.dispatch('user/getInfo')
        next()
      }
    }
  } else {
    /* has no token*/

    if (whiteList.indexOf(to.path) !== -1) {
      // in the free login whitelist, go directly
      next()
    } else {
      // other pages that do not have permission to access are redirected to the login page.
      // redirect的作用：用户想去to.path，但是由于没有token所以去不了。
      // 当登录成功后就会直接跳转到redirect路径（即用户想去的页面）
      next(`/login?redirect=${to.path}`)
      NProgress.done()
    }
  }
})
// 全局后置导航守卫
router.afterEach(() => {
  // finish progress bar
  NProgress.done()
})
